From: Brian Candler <b.candler@...>
Date: 2008-12-11T00:20:39+09:00
Subject: Re: compare 2 text files - check for difference - Please help

Mmcolli00 Mom wrote:
> I just used this on my txt files however, I can't get the script to 
> output only when a line was disimillar. Right now it shows everything.
> 
> p sdiff = lines1.sdiff(lines2)
> 
> I want to output the following if sdiff returns the @action=!
> [#<Diff::LCS::ContextChange:24309500 @action=! positions=0,0 
> elements="1,2\n","1,2,3\n">

I don't understand.

If the two files are identical, you should get an empty array. Is that 
not the case? You can test for an empty array using sdiff.empty?

If the two files are not identical, you will get a series of elements 
telling you chunks which are different, and for each chunk what is 
different. This is similar to the "diff" command at the shell.
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